IC:2021-05-19, Bump to v5.1.0-rc1+dev452

Update Readme and version.h

README.md

@@ -11,6 +11,20 @@ The autogenerated OSAL user's guide can be viewed at <https://github.com/nasa/cF
 
 ## Version History
 
+### Development Build: v5.1.0-rc1+dev452
+
+- Makes filenames better match terms used in implementation.
+- Propagates return code from the caller in low-level implementations when status is not `OS_SUCCESS`.
+- The status returned from `OS_rmdir()` should now be correct if the implementation failed.
+- Adds details to log file and can be cross referenced back to documentation.
+- Updates most of the conditions in the "unit tests" to use the support macros whenever possible.
+- The macros display the function being called as well as the return value being checked for and enables that documented return codes are being tested. Removes repetition in the test programs.
+- Removes blank lines in test log while preserving extra newlines in the event that the test case was intentionally adding whitespace.
+- Adds tests for object id inline functions: `OS_ObjectIdToInteger`, `OS_ObjectIdFromInteger`, `OS_ObjectIdEqual`, `OS_ObjectIdDefined`
+- Changes tests to use valid inputs for all `OS_mkdir` calls.
+- [docs] Improves config guide documentation issues referenced in #384, #640, #672
+- [continuous-integration] Adds new workflow to display CodeQL alerts preview
+
 ### Development Build: v5.1.0-rc1+dev434
 
 - Updates the configuration guide to reflect cmake build system and the currently provided set of OS/BSP layers. Removes obsolete items from guide.

src/os/inc/osapi-version.h

@@ -34,7 +34,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define OS_BUILD_NUMBER   434
+#define OS_BUILD_NUMBER   452
 #define OS_BUILD_BASELINE "v5.1.0-rc1"
 
 /*